feat: Consider AssignRef as assignment

Author: hirokinoue

src/Parse/Visitor/FunctionLikeFindingVisitor.php

@@ -7,6 +7,7 @@
 use PhpParser\Node;
 use PhpParser\Node\Expr\Assign;
 use PhpParser\Node\Expr\AssignOp;
+use PhpParser\Node\Expr\AssignRef;
 use PhpParser\Node\FunctionLike;
 use PhpParser\NodeVisitor\FindingVisitor;
 use PhpParser\Node\Stmt\Class_;
@@ -31,8 +32,10 @@ public function enterNode(Node $node) {
             // Record class name
             $this->currentNamespace = $node->name ? $node->name->name : null;
         }
-
-        if ($node instanceof Assign || $node instanceof AssignOp) {
+        if ($node instanceof Assign ||
+            $node instanceof AssignOp ||
+            $node instanceof AssignRef
+        ) {
             $node->var->setAttribute('assigned', true); // Mark as assigned
         }
         if ($node instanceof FunctionLike) {